TY - JOUR
T1 - Thermophysical properties of (MgxLa0.5-xSm 0.5)2(Zr0.7Ce0.3)2O 7-x (x=0, 0.1, 0.2, 0.3) ceramic for thermal barrier coatings
AU - Liu, Ling
AU - Wang, Fuchi
AU - Ma, Zhuang
AU - Xu, Qiang
AU - Fang, Shige
PY - 2011/3
Y1 - 2011/3
N2 - A series of complex rare-earth zirconates (MgxLa 0.5-xSm0.5)2 (Zr0.7Ce 0.3)2O7-x (x=0, 0.1, 0.2, 0.3) ceramics for thermal barrier coatings (TBCs) were synthesized by coprecipitation-calcination method. Their phase composition, microstructure, and the thermophysical properties were investigated. The results showed that single-phase (Mg xLa0.5-xSm0.5)2(Zr 0.7Ce0.3)2O7-x (x=0, 0.1, 0.2, 0.3) with pyrochlore structure were prepared, and the microstructure of the products were dense. The thermal conductivity of the ceramics remarkably decreased through doping up to x=0.2 with a minimum value around 1.57 W·(m· K)-1. As a function of increasing x, the thermal expansion coefficient of (MgxLa0.5-xSm0.5) 2(Zr0.7Ce0.3)2O7-x decreased firstly and then increased. The maximum value (11.3 × 10 -6 K-1) was achieved for the sample with the same composite point x=0.2. These results imply that with respect to thermal properties the optimum material is (Mg0.2La0.3Sm 0.5)2 (Zr0.7Ce0.3)2O 6.8 for the ceramic layer in TBCs system.
AB - A series of complex rare-earth zirconates (MgxLa 0.5-xSm0.5)2 (Zr0.7Ce 0.3)2O7-x (x=0, 0.1, 0.2, 0.3) ceramics for thermal barrier coatings (TBCs) were synthesized by coprecipitation-calcination method. Their phase composition, microstructure, and the thermophysical properties were investigated. The results showed that single-phase (Mg xLa0.5-xSm0.5)2(Zr 0.7Ce0.3)2O7-x (x=0, 0.1, 0.2, 0.3) with pyrochlore structure were prepared, and the microstructure of the products were dense. The thermal conductivity of the ceramics remarkably decreased through doping up to x=0.2 with a minimum value around 1.57 W·(m· K)-1. As a function of increasing x, the thermal expansion coefficient of (MgxLa0.5-xSm0.5) 2(Zr0.7Ce0.3)2O7-x decreased firstly and then increased. The maximum value (11.3 × 10 -6 K-1) was achieved for the sample with the same composite point x=0.2. These results imply that with respect to thermal properties the optimum material is (Mg0.2La0.3Sm 0.5)2 (Zr0.7Ce0.3)2O 6.8 for the ceramic layer in TBCs system.
UR - http://www.scopus.com/inward/record.url?scp=79952594131&partnerID=8YFLogxK
U2 - 10.1111/j.1551-2916.2010.04385.x
DO - 10.1111/j.1551-2916.2010.04385.x
M3 - Article
AN - SCOPUS:79952594131
SN - 0002-7820
VL - 94
SP - 675
EP - 678
JO - Journal of the American Ceramic Society
JF - Journal of the American Ceramic Society
IS - 3
ER -